错误之间传递信息

Question

我是新的android开发，目前我在android studio 1.5与棉花糖6.0 api 23，sdk工具24.4.1工作。我只是测试通过明确的意图传递额外的信息，但每次运行后我有

E/Surface: getSlotFromBufferLocked: unknown buffer: 0xaca5a0c0 

在我的logcat。我想我没有错误的代码。点击按钮后，我开始了第二项活动。所以意图切换正在工作，但没有信息通过那里。所以，我怎么能解决这个奇怪的问题，帮助将不胜感激

这里是我的代码：

package project.kalyan.intentdemo; 

import android.content.Intent; 
import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.TextView; 

public class Main_intent_Activity extends AppCompatActivity implements View.OnClickListener 
{ 


    TextView tv; 
    EditText ed; 
    Button sendme; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main_intent_); 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
     fab.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) 
         .setAction("Action", null).show(); 





      } 
     }); 

     tv=(TextView)findViewById(R.id.firstIntent); 
     sendme=(Button)findViewById(R.id.button); 
     sendme.setOnClickListener(this); 
    } 

    @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_intent_, 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; 
     } 

     return super.onOptionsItemSelected(item); 
    } 

    @Override 
    public void onClick(View v) 
    { 
     if(v.getId()==R.id.button) 
     { 
      Intent intent=new Intent(Main_intent_Activity.this,Activity_2.class); 
      ed=(EditText)findViewById(R.id.intenttext); 
      String passingtext=ed.getText().toString(); 
      intent.putExtra("Firstmessage:",passingtext); 

      startActivity(intent); 
     } 


    } 
} 

我已经在意图参数试图getApplicationContext（），但没有改变

和我的活动2码

package project.kalyan.intentdemo; 

import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.util.Log; 
import android.view.View; 
import android.widget.TextView; 

public class Activity_2 extends AppCompatActivity { 

    TextView activetext; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_activity_2); 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
     fab.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG) 
         .setAction("Action", null).show(); 
      } 
     }); 
     activetext=(TextView)findViewById(R.id.activity2text); 
     Bundle information=getIntent().getExtras(); 
     if(information==null) 
     { 
      Log.d("State is :","Nothing is passed from main Activity"); 
      return; 
     } 
     String s=information.getString("Firstmessage"); 
     activetext.setText(s); 

    } 

} 

Answer 1

你的关键是"Firstmessage:"不"Firstmessage"，你需要使用的包相同的密钥从意图返回在2次活动

String s=information.getString("Firstmessage:"); 

也请您查找因为logcat中最有可能这是不是导致错误