标签:super tag static layout toast extend extras stat pack
参考:https://blog.csdn.net/hellobenji/article/details/79978701
https://www.jianshu.com/p/5f3953bc012e
package com.example.myapplication; import androidx.annotation.Nullable; import androidx.appcompat.app.AppCompatActivity; import android.content.Intent; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.Toast; public class MainActivity extends AppCompatActivity { private static final String TAG = "test"; final int REQUEST_CODE = 100; @Override protected void onCreate(Bundle savedInstanceState) { Log.d(TAG, "onCreate: test 1 "); Log.e(TAG, "onCreate: test 2 "); super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button bt = findViewById(R.id.button1); bt.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View view) { Toast.makeText(MainActivity.this,"button is clicked",Toast.LENGTH_SHORT).show(); Log.e(TAG,"==========匿名内部类======1===="); Log.d(TAG,"==========匿名内部类======2===="); } }); Button bt2 = findViewById(R.id.button2); MyClickListener mcl = new MyClickListener(); bt2.setOnClickListener(mcl); } @Override protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) { super.onActivityResult(requestCode, resultCode, data); Log.e(TAG, "onActivityResult: requestCode:" + requestCode); Log.e(TAG, "onActivityResult: resultCode:" + resultCode); if(requestCode == this.REQUEST_CODE){ switch(resultCode){ case RESULT_OK: Bundle b = data.getExtras(); String str = b.getString("Result"); //获取 Result 中的值,为 "from Activity2" Log.e(TAG, "onActivityResult: str:" + str); break; default: break; } } } class MyClickListener implements View.OnClickListener{ @Override public void onClick(View view) { //在控制台输出一条语句 Log.e(TAG,"刚刚点击的按钮时注册了内部类监听器对象的按钮"); Intent intent = new Intent(MainActivity.this, secondActivity.class); //利用 Intent 传递数据。 intent.putExtra("age",18); intent.putExtra("name","kelly"); intent.putExtra("level",‘A‘); //利用 Bundle 传递数据。 Bundle myBundle = new Bundle(); myBundle.putString("author","mole"); intent.putExtras(myBundle); //startActivity(intent); startActivityForResult(intent,REQUEST_CODE); } } @Override protected void onDestroy() { super.onDestroy(); } @Override protected void onPause() { super.onPause(); } }
secondActivity.java
package com.example.myapplication; import android.content.Intent; import android.os.Bundle; import android.os.PersistableBundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.Toast; import androidx.annotation.Nullable; import androidx.appcompat.app.AppCompatActivity; public class secondActivity extends AppCompatActivity { private static final String TAG = "secondActivity"; @Override public void onCreate(@Nullable Bundle savedInstanceState, @Nullable PersistableBundle persistentState) { super.onCreate(savedInstanceState, persistentState); } @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_second); Intent intent = getIntent(); String name = intent.getStringExtra("name"); int age = intent.getIntExtra("age",100); char level = intent.getCharExtra("level",‘C‘); Log.e(TAG, "onCreate: name:" + name); Log.e(TAG, "onCreate: age:" + age); Log.e(TAG, "onCreate: level:" + level); Log.e(TAG, "onCreate() called with: savedInstanceState = [" + savedInstanceState + "]"); Bundle myBundle = intent.getExtras(); String author = myBundle.getString("author"); Log.e(TAG, "onCreate: author:" + author); Intent intent2 = new Intent(); Bundle bundle = new Bundle(); bundle.putString("Result","from Activity2"); intent2.putExtras(bundle); this.setResult(RESULT_OK,intent2); //通过 intent 将数据返回给 Activity1,RESULT_OK Button bt = findViewById(R.id.button_second); bt.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Toast.makeText(secondActivity.this,"button is clicked",Toast.LENGTH_SHORT).show(); Log.e(TAG,"==========匿名内部类======secondActivity===="); finish();// end the activity // Intent intent = new Intent(secondActivity.this, MainActivity.class); // startActivity(intent); } }); } }
startActivityForResult 和 onActivityResult
标签:super tag static layout toast extend extras stat pack
原文地址:https://www.cnblogs.com/yuguangyuan/p/13218912.html