- 新建一个ActivityCollecter类做为活动管理器
public class ActivityCollector {
public static List<Activity> activities = new ArrayList<>();
public static void addActivity(Activity activity){
activities.add(activity);
}
public static void removeActivity(Activity activity){
activities.remove(activity);
}
public static void finishAll(){
for (Activity activity : activities){
if (!activity.isFinishing()){
activity.finish();
}
}
}
}
- 2.修改自己写的BaseActivity中的onCreate()和onDestroy()方法
public class BaseActivity extends AppCompatActivity{
private static final String TAG = "BaseActivity";
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d(TAG, getClass().getName());
ActivityCollector.addActivity(this);//将启动的活动都存入activities
}
@Override
protected void onDestroy() {
super.onDestroy();
ActivityCollector.removeActivity(this);//让退出的活动不再存储再activities
}
}
//FirstActivity
public class FirstActivity extends BaseActivity {
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
String tempData = "丢失的数据";
outState.putString("maple",tempData);//第一个参数是键值，第二个参数是需要保存的数据
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode){
case 1:
if(resultCode == RESULT_OK){
String returnedData = data.getStringExtra("maple");
Toast.makeText(this,returnedData,Toast.LENGTH_SHORT).show();
}
break;
default:
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.first_layout);
if(savedInstanceState != null){
String tempData = savedInstanceState.getString("maple");
Toast.makeText(this,tempData,Toast.LENGTH_SHORT).show();
}
Button button1 = (Button)findViewById(R.id.button_1);
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(FirstActivity.this,"You clicked Button 1",Toast.LENGTH_SHORT).show();
Intent intent = new Intent(FirstActivity.this,SecondActivity.class);
startActivityForResult(intent,1);
}
});
button1.setText("走你");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main,menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case R.id.add_item:
Toast.makeText(this,"You clicked Add",Toast.LENGTH_SHORT).show();
break;
case R.id.remove_item:
Toast.makeText(this,"You clicked Remove",Toast.LENGTH_SHORT).show();
break;
}
return true;
}
}
//SecondActivity
public class SecondActivity extends BaseActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
Button button2 = (Button)findViewById(R.id.button_2);
Intent intent = new Intent();//只用来携带被传递的值，不跳转活动
String data = "Hello FirstActivity";
intent.putExtra("maple",data);
setResult(RESULT_OK,intent);
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ActivityCollector.finishAll();//销毁所有活动
}
});
}
}
- 4.当点击SecondActivity中的按钮时，就会直接退出程序。你还可以在销毁所有活动后的代码后面再加上 android.os.Process.killProcess(android.os.Process.myPid());其中killProcess()方法用于杀掉一个进程，它接受一个进程id参数，我们可以通过myPid()方法来获得当前程序的id。但killProcess()方法只能用于杀掉当前程序的进程，不能用这个方法去杀掉其它程序。
