[英]Returning back to a previous activity?
我有一个打开子活动的主要活动:
startActivity(new Intent(this, ChildActivity.class));
在子活动中,我按“上Back
按钮返回到主活动。 我在主要活动中也有以下代码:
@Override
protected void onResume() {
super.onResume();
dosomething();
}
但是,永远不会达到onResume
。
我想念什么吗?
这样,当您从子Activity
返回到父Activity
时,它将调用onResume()
:
MainActivity.java
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView mTextView = (TextView)findViewById(R.id.mTextView);
mTextView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,ChildActivity.class);
startActivity(intent);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
protected void onResume() {
super.onResume();
Toast.makeText(this,"Yes calling",Toast.LENGTH_LONG).show();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
ChildActivity.java
public class ChildActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_child);
Toolbar mtooToolbar= (Toolbar)findViewById(R.id.mtoolBar);
setSupportActionBar(mtooToolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_child, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
if(id==android.R.id.home){
onBackPressed();
}
return super.onOptionsItemSelected(item);
}
@Override
public void onBackPressed() {
super.onBackPressed();
}
}
当活动将开始与用户进行交互时,将调用onResume()
。 此时,您的活动位于活动堆栈的顶部,而用户输入也进入了活动堆栈。
始终跟随onPause()
。
检查此链接以了解关系: 活动生命周期
您可以使用finish()方法完成活动。
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