Android —— Activity的四種啟動(dòng)模式

除了Activity的生命周期外躯泰，Activity的啟動(dòng)模式也是一個(gè)難點(diǎn)憔鬼，有時(shí)候?yàn)榱藵M(mǎn)足項(xiàng)目的特殊需求，就必須使用Activity的啟動(dòng)模式。

在默認(rèn)情況下沙郭，當(dāng)我們多次啟動(dòng)同一個(gè)Activity的時(shí)候，系統(tǒng)會(huì)創(chuàng)建多個(gè)實(shí)例并把它們放入任務(wù)棧中押袍，但是有些場(chǎng)景重復(fù)創(chuàng)建多個(gè)實(shí)例琼开，是沒(méi)有必要且浪費(fèi)資源的，這就需要啟動(dòng)模式來(lái)修改系統(tǒng)的默認(rèn)行為精算。

下面瓢宦，我將以理論+實(shí)踐的形式為大家介紹Activity的啟動(dòng)模式。

standard標(biāo)準(zhǔn)模式

這是系統(tǒng)的默認(rèn)啟動(dòng)模式灰羽，采用這種模式的Activity無(wú)論是否已經(jīng)存在實(shí)例驮履，都會(huì)重新創(chuàng)建一個(gè)實(shí)例鱼辙，在這種模式下誰(shuí)啟動(dòng)了這個(gè)Activity，那么這個(gè)Activity就運(yùn)行在啟動(dòng)它的那個(gè)Activity所在的棧中玫镐。

實(shí)踐：MainActivity 采用 standard 模式

// 核心代碼展示
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    final static String TAG = "MainActivityLog";
    Button button;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.i(TAG, getTaskId() + "onCreate: " + getIntent().getIntExtra("id",0));
        button = findViewById(R.id.button);
        button.setOnClickListener(this);
    }
    
    @Override
    protected void onStart() {
        super.onStart();
        Log.i(TAG, getTaskId() +"onStart: " + getIntent().getIntExtra("id",0));
    }
    
    //此處省略重復(fù)代碼
    
    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.button:
                Intent intent = new Intent(this,MainActivity.class);
                intent.putExtra("id",1);
                startActivity(intent);
        }
    }
}

// 日志結(jié)果展示
// 啟動(dòng)MainActivity
2022-04-21 18:37:59.622 4072-4072/com.hnucm.myapplication I/MainActivityLog: 12onCreate: 0
2022-04-21 18:37:59.625 4072-4072/com.hnucm.myapplication I/MainActivityLog: 12onStart: 0
2022-04-21 18:37:59.626 4072-4072/com.hnucm.myapplication I/MainActivityLog: 12onResume: 0
// 點(diǎn)擊MainActivity的按鈕啟動(dòng)MainActivity
2022-04-21 18:38:03.336 4072-4072/com.hnucm.myapplication I/MainActivityLog: 12onPause: 0
2022-04-21 18:38:03.373 4072-4072/com.hnucm.myapplication I/MainActivityLog: 12onCreate: 1
2022-04-21 18:38:03.378 4072-4072/com.hnucm.myapplication I/MainActivityLog: 12onStart: 1
2022-04-21 18:38:03.379 4072-4072/com.hnucm.myapplication I/MainActivityLog: 12onResume: 1
2022-04-21 18:38:03.939 4072-4072/com.hnucm.myapplication I/MainActivityLog: 12onStop: 0
2022-04-21 18:38:03.942 4072-4072/com.hnucm.myapplication I/MainActivityLog: 12onSaveInstanceState: 0

singleTop棧頂復(fù)用模式

在這種模式下倒戏，如果新的Activity已經(jīng)位于任務(wù)棧的棧頂，那么此Activity不會(huì)被重新創(chuàng)建恐似，同時(shí)它的NewIntent方法將會(huì)被回調(diào)杜跷。如果新Activity的實(shí)例已存在但不是位于棧頂，那么新Activity依然會(huì)被創(chuàng)建矫夷。

實(shí)踐：MainActivity 采用 singleTop 模式

// 核心代碼展示
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    final static String TAG = "MainActivityLog";
    Button button;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.i(TAG, getTaskId() + "onCreate: " + getIntent().getIntExtra("id",0));
        button = findViewById(R.id.button);
        button.setOnClickListener(this);
    }
    
    @Override
    protected void onStart() {
        super.onStart();
        Log.i(TAG, getTaskId() +"onStart: " + getIntent().getIntExtra("id",0));
    }
    
    //此處省略重復(fù)代碼
    
    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.button:
                Intent intent = new Intent(this,MainActivity.class);
                intent.putExtra("id",1);
                startActivity(intent);
        }
    }
}

// 日志結(jié)果展示
// 啟動(dòng)MainActivity
2022-04-21 18:52:30.963 4205-4205/com.hnucm.myapplication I/MainActivityLog: 13onCreate: 0
2022-04-21 18:52:30.968 4205-4205/com.hnucm.myapplication I/MainActivityLog: 13onStart: 0
2022-04-21 18:52:30.970 4205-4205/com.hnucm.myapplication I/MainActivityLog: 13onResume: 0
// 點(diǎn)擊MainActivity的按鈕啟動(dòng)MainActivity
2022-04-21 18:52:35.601 4205-4205/com.hnucm.myapplication I/MainActivityLog: 13onPause: 0
2022-04-21 18:52:35.603 4205-4205/com.hnucm.myapplication I/MainActivityLog: 13onNewIntent: 0
2022-04-21 18:52:35.604 4205-4205/com.hnucm.myapplication I/MainActivityLog: 13onResume: 0

MainActivity 采用 singleTop 模式葛闷，SecondActivity采用 standard 模式

// 核心代碼展示
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    final static String TAG = "MainActivityLog";
    Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.i(TAG, getTaskId() + "onCreate: " + getIntent().getIntExtra("id",0));
        button = findViewById(R.id.button);
        button.setOnClickListener(this);
    }

    @Override
    protected void onStart() {
        super.onStart();
        Log.i(TAG, getTaskId() +"onStart: " + getIntent().getIntExtra("id",0));
    }

    //此處省略重復(fù)代碼
    
    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.button:
                Intent intent = new Intent(this,SecondActivity.class);
                startActivity(intent);
        }
    }
}

public class SecondActivity extends AppCompatActivity implements View.OnClickListener {
    final static String TAG = "SecondActivityLog";
    Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        Log.i(TAG, getTaskId() +"onCreate: " + getIntent().getIntExtra("id",0));
        button = findViewById(R.id.button2);
        button.setOnClickListener(this);
    }
    
    @Override
    protected void onStart() {
        super.onStart();
        Log.i(TAG, getTaskId() +"onStart: " + getIntent().getIntExtra("id",0));
    }

    //此處省略重復(fù)代碼

    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.button2:
                Intent intent = new Intent(this,MainActivity.class);
                intent.putExtra("id",1);
                startActivity(intent);
        }
    }
}

// 日志結(jié)果展示
// 啟動(dòng)MainActivity
2022-04-21 18:58:54.961 4815-4815/com.hnucm.myapplication I/MainActivityLog: 20onCreate: 0
2022-04-21 18:58:54.964 4815-4815/com.hnucm.myapplication I/MainActivityLog: 20onStart: 0
2022-04-21 18:58:54.966 4815-4815/com.hnucm.myapplication I/MainActivityLog: 20onResume: 0
// 點(diǎn)擊MainActivity的按鈕啟動(dòng)SecondActivity
2022-04-21 19:00:13.845 4815-4815/com.hnucm.myapplication I/MainActivityLog: 20onPause: 0
2022-04-21 19:00:13.895 4815-4815/com.hnucm.myapplication I/SecondActivityLog: 20onCreate: 0
2022-04-21 19:00:13.898 4815-4815/com.hnucm.myapplication I/SecondActivityLog: 20onStart: 0
2022-04-21 19:00:13.900 4815-4815/com.hnucm.myapplication I/SecondActivityLog: 20onResume: 0
2022-04-21 19:00:14.531 4815-4815/com.hnucm.myapplication I/MainActivityLog: 20onStop: 0
2022-04-21 19:00:14.534 4815-4815/com.hnucm.myapplication I/MainActivityLog: 20onSaveInstanceState: 0
// 點(diǎn)擊SecondActivity的按鈕啟動(dòng)MainActivity
2022-04-21 19:00:21.287 4815-4815/com.hnucm.myapplication I/SecondActivityLog: 20onPause: 0
2022-04-21 19:00:21.321 4815-4815/com.hnucm.myapplication I/MainActivityLog: 20onCreate: 1
2022-04-21 19:00:21.329 4815-4815/com.hnucm.myapplication I/MainActivityLog: 20onStart: 1
2022-04-21 19:00:21.331 4815-4815/com.hnucm.myapplication I/MainActivityLog: 20onResume: 1
2022-04-21 19:00:21.865 4815-4815/com.hnucm.myapplication I/SecondActivityLog: 20onStop: 0
2022-04-21 19:00:21.866 4815-4815/com.hnucm.myapplication I/SecondActivityLog: 20onSaveInstanceState: 0

singleTask棧內(nèi)復(fù)用模式

這是一種單實(shí)例模式，在這種模式下双藕，只要Activity在一個(gè)棧中存在淑趾，那么多次啟動(dòng)此Activity都不會(huì)重新創(chuàng)建實(shí)例，而是回調(diào)onNewIntent()忧陪。

實(shí)踐：MainActivity 采用 singleTask 模式

// 核心代碼展示
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    final static String TAG = "MainActivityLog";
    Button button;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.i(TAG, getTaskId() + "onCreate: " + getIntent().getIntExtra("id",0));
        button = findViewById(R.id.button);
        button.setOnClickListener(this);
    }
    
    @Override
    protected void onStart() {
        super.onStart();
        Log.i(TAG, getTaskId() +"onStart: " + getIntent().getIntExtra("id",0));
    }
    
    //此處省略重復(fù)代碼
    
    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.button:
                Intent intent = new Intent(this,MainActivity.class);
                intent.putExtra("id",1);
                startActivity(intent);
        }
    }
}

// 日志結(jié)果展示
// 啟動(dòng)MainActivity
2022-04-21 19:05:26.977 4945-4945/com.hnucm.myapplication I/MainActivityLog: 21onCreate: 0
2022-04-21 19:05:26.981 4945-4945/com.hnucm.myapplication I/MainActivityLog: 21onStart: 0
2022-04-21 19:05:26.982 4945-4945/com.hnucm.myapplication I/MainActivityLog: 21onResume: 0
// 點(diǎn)擊MainActivity的按鈕啟動(dòng)MainActivity
2022-04-21 19:05:29.539 4945-4945/com.hnucm.myapplication I/MainActivityLog: 21onPause: 0
2022-04-21 19:05:29.540 4945-4945/com.hnucm.myapplication I/MainActivityLog: 21onNewIntent: 0
2022-04-21 19:05:29.541 4945-4945/com.hnucm.myapplication I/MainActivityLog: 21onResume: 0

MainActivity 采用 singleTask 模式扣泊，SecondActivity采用 standard 模式

// 核心代碼展示
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    final static String TAG = "MainActivityLog";
    Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.i(TAG, getTaskId() + "onCreate: " + getIntent().getIntExtra("id",0));
        button = findViewById(R.id.button);
        button.setOnClickListener(this);
    }

    @Override
    protected void onStart() {
        super.onStart();
        Log.i(TAG, getTaskId() +"onStart: " + getIntent().getIntExtra("id",0));
    }

    //此處省略重復(fù)代碼
    
    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.button:
                Intent intent = new Intent(this,SecondActivity.class);
                startActivity(intent);
        }
    }
}

public class SecondActivity extends AppCompatActivity implements View.OnClickListener {
    final static String TAG = "SecondActivityLog";
    Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        Log.i(TAG, getTaskId() +"onCreate: " + getIntent().getIntExtra("id",0));
        button = findViewById(R.id.button2);
        button.setOnClickListener(this);
    }
    
    @Override
    protected void onStart() {
        super.onStart();
        Log.i(TAG, getTaskId() +"onStart: " + getIntent().getIntExtra("id",0));
    }

    //此處省略重復(fù)代碼

    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.button2:
                Intent intent = new Intent(this,MainActivity.class);
                intent.putExtra("id",1);
                startActivity(intent);
        }
    }
}

// 日志結(jié)果展示
// 啟動(dòng)MainActivity
2022-04-21 19:11:04.891 5045-5045/com.hnucm.myapplication I/MainActivityLog: 22onCreate: 0
2022-04-21 19:11:04.894 5045-5045/com.hnucm.myapplication I/MainActivityLog: 22onStart: 0
2022-04-21 19:11:04.897 5045-5045/com.hnucm.myapplication I/MainActivityLog: 22onResume: 0
// 點(diǎn)擊MainActivity的按鈕啟動(dòng)SecondActivity 
2022-04-21 19:11:18.653 5045-5045/com.hnucm.myapplication I/MainActivityLog: 22onPause: 0
2022-04-21 19:11:18.690 5045-5045/com.hnucm.myapplication I/SecondActivityLog: 22onCreate: 0
2022-04-21 19:11:18.694 5045-5045/com.hnucm.myapplication I/SecondActivityLog: 22onStart: 0
2022-04-21 19:11:18.696 5045-5045/com.hnucm.myapplication I/SecondActivityLog: 22onResume: 0
2022-04-21 19:11:19.232 5045-5045/com.hnucm.myapplication I/MainActivityLog: 22onStop: 0
2022-04-21 19:11:19.235 5045-5045/com.hnucm.myapplication I/MainActivityLog: 22onSaveInstanceState: 0
// 點(diǎn)擊SecondActivity的按鈕啟動(dòng)MainActivity
2022-04-21 19:11:29.909 5045-5045/com.hnucm.myapplication I/SecondActivityLog: 22onPause: 0
2022-04-21 19:11:29.928 5045-5045/com.hnucm.myapplication I/MainActivityLog: 22onRestart: 0
2022-04-21 19:11:29.930 5045-5045/com.hnucm.myapplication I/MainActivityLog: 22onStart: 0
2022-04-21 19:11:29.931 5045-5045/com.hnucm.myapplication I/MainActivityLog: 22onNewIntent: 0
2022-04-21 19:11:29.932 5045-5045/com.hnucm.myapplication I/MainActivityLog: 22onResume: 0
2022-04-21 19:11:30.498 5045-5045/com.hnucm.myapplication I/SecondActivityLog: 22onStop: 0
2022-04-21 19:11:30.499 5045-5045/com.hnucm.myapplication I/SecondActivityLog: 22onDestroy: 0

singleInstance單實(shí)例模式

這是一種加強(qiáng)的singleTask模式，它除了具有singleTask模式的所有特性外嘶摊，還加強(qiáng)了一點(diǎn)延蟹，那就是具有此模式的Activity只能單獨(dú)的位于一個(gè)任務(wù)棧中。

實(shí)踐：MainActivity 采用 singleInstance 模式

// 核心代碼展示
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    final static String TAG = "MainActivityLog";
    Button button;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.i(TAG, getTaskId() + "onCreate: " + getIntent().getIntExtra("id",0));
        button = findViewById(R.id.button);
        button.setOnClickListener(this);
    }
    
    @Override
    protected void onStart() {
        super.onStart();
        Log.i(TAG, getTaskId() +"onStart: " + getIntent().getIntExtra("id",0));
    }
    
    //此處省略重復(fù)代碼
    
    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.button:
                Intent intent = new Intent(this,MainActivity.class);
                intent.putExtra("id",1);
                startActivity(intent);
        }
    }
}

// 日志結(jié)果展示
// 啟動(dòng)MainActivity
2022-04-21 19:18:03.183 5193-5193/com.hnucm.myapplication I/MainActivityLog: 23onCreate: 0
2022-04-21 19:18:03.186 5193-5193/com.hnucm.myapplication I/MainActivityLog: 23onStart: 0
2022-04-21 19:18:03.188 5193-5193/com.hnucm.myapplication I/MainActivityLog: 23onResume: 0
// 點(diǎn)擊MainActivity的按鈕啟動(dòng)MainActivity
2022-04-21 19:18:11.416 5193-5193/com.hnucm.myapplication I/MainActivityLog: 23onPause: 0
2022-04-21 19:18:11.419 5193-5193/com.hnucm.myapplication I/MainActivityLog: 23onNewIntent: 0
2022-04-21 19:18:11.419 5193-5193/com.hnucm.myapplication I/MainActivityLog: 23onResume: 0

MainActivity 采用 singleInstance 模式叶堆，SecondActivity采用 standard 模式

// 核心代碼展示
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    final static String TAG = "MainActivityLog";
    Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.i(TAG, getTaskId() + "onCreate: " + getIntent().getIntExtra("id",0));
        button = findViewById(R.id.button);
        button.setOnClickListener(this);
    }

    @Override
    protected void onStart() {
        super.onStart();
        Log.i(TAG, getTaskId() +"onStart: " + getIntent().getIntExtra("id",0));
    }

    //此處省略重復(fù)代碼
    
    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.button:
                Intent intent = new Intent(this,SecondActivity.class);
                startActivity(intent);
        }
    }
}

public class SecondActivity extends AppCompatActivity implements View.OnClickListener {
    final static String TAG = "SecondActivityLog";
    Button button;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
        Log.i(TAG, getTaskId() +"onCreate: " + getIntent().getIntExtra("id",0));
        button = findViewById(R.id.button2);
        button.setOnClickListener(this);
    }
    
    @Override
    protected void onStart() {
        super.onStart();
        Log.i(TAG, getTaskId() +"onStart: " + getIntent().getIntExtra("id",0));
    }

    //此處省略重復(fù)代碼

    @Override
    public void onClick(View view) {
        switch (view.getId()){
            case R.id.button2:
                Intent intent = new Intent(this,MainActivity.class);
                intent.putExtra("id",1);
                startActivity(intent);
        }
    }
}

// 日志結(jié)果展示
// 啟動(dòng)MainActivity
2022-04-21 19:19:25.783 5261-5261/com.hnucm.myapplication I/MainActivityLog: 24onCreate: 0
2022-04-21 19:19:25.786 5261-5261/com.hnucm.myapplication I/MainActivityLog: 24onStart: 0
2022-04-21 19:19:25.787 5261-5261/com.hnucm.myapplication I/MainActivityLog: 24onResume: 0
// 點(diǎn)擊MainActivity的按鈕啟動(dòng)SecondActivity 
2022-04-21 19:19:34.745 5261-5261/com.hnucm.myapplication I/MainActivityLog: 24onPause: 0
2022-04-21 19:19:34.825 5261-5261/com.hnucm.myapplication I/SecondActivityLog: 25onCreate: 0
2022-04-21 19:19:34.868 5261-5261/com.hnucm.myapplication I/SecondActivityLog: 25onStart: 0
2022-04-21 19:19:34.871 5261-5261/com.hnucm.myapplication I/SecondActivityLog: 25onResume: 0
2022-04-21 19:19:35.464 5261-5261/com.hnucm.myapplication I/MainActivityLog: 24onStop: 0
2022-04-21 19:19:35.466 5261-5261/com.hnucm.myapplication I/MainActivityLog: 24onSaveInstanceState: 0
// 點(diǎn)擊SecondActivity的按鈕啟動(dòng)MainActivity
2022-04-21 19:19:45.068 5261-5261/com.hnucm.myapplication I/SecondActivityLog: 25onPause: 0
2022-04-21 19:19:45.078 5261-5261/com.hnucm.myapplication I/MainActivityLog: 24onRestart: 0
2022-04-21 19:19:45.079 5261-5261/com.hnucm.myapplication I/MainActivityLog: 24onStart: 0
2022-04-21 19:19:45.080 5261-5261/com.hnucm.myapplication I/MainActivityLog: 24onNewIntent: 0
2022-04-21 19:19:45.081 5261-5261/com.hnucm.myapplication I/MainActivityLog: 24onResume: 0
2022-04-21 19:19:45.802 5261-5261/com.hnucm.myapplication I/SecondActivityLog: 25onStop: 0
2022-04-21 19:19:45.803 5261-5261/com.hnucm.myapplication I/SecondActivityLog: 25onSaveInstanceState: 0

以上就是Activity啟動(dòng)模式的介紹阱飘。

歡迎留言指出錯(cuò)誤。

最后編輯于：2022.04.21 19:44:25

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