[英]Trying to switch between activities, don't know why this isn't working?
這是將偵聽器添加到活動文件中的按鈕的代碼:
get_started_imready = (Button) findViewById(R.id.im_ready);
get_started_imready.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
//Log.v("BUTTON ACTIVITY ENTERED","hi");
startActivity(new Intent(ThirdActivity.this, SetupPageOne.class));
finish();
}
});
這是相應的xml文件中的按鈕代碼:
<Button
android:id="@+id/im_ready"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world"
android:clickable="true"
/>
這是我第二項活動的代碼:SetupPageOne
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class SetupPageOne extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_setup_page_one);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.setup_page_one, 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();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
當我嘗試在我的android設備上運行此代碼時,程序運行時沒有任何運行時錯誤,但按鈕本身沒有響應,並且未切換到第二個活動。
有人知道嗎 謝謝!
get_started_imready = (Button) findViewById(R.id.im_ready);
get_started_imready.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
//Log.v("BUTTON ACTIVITY ENTERED","hi");
startActivity(new Intent(getActivity(), SetupPageOne.class));
finish();
}
});
請使用getActivity()
或getApplication()
而不是ThirdActivity.this
因為android對線程敏感,因此您無法從UI線程引用Activity線程。
有時,非常有用的是要明確意圖的來源和去向。
我的意思是,當您創建新的意圖時,包括兩個活動的完整程序包路徑:
Intent intent = new intent(com.example.packageone.ThirdActivity.this, com.example.packagetwo.SetupPageOne.class);
另外,如果您想再次檢查代碼是否達到了該意圖(即確實有一個OnClickListener),請在為新的Activity創建此意圖之前進行Toast!
Toast.makeText(getApplicationContext(), "buttonName is being clicked!", Toast.LENGTH_LONG).show();
希望這會有所幫助,祝您好運!
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