每当我点击第二个按钮时,错误Unfortunately,UsingIntent has stopped working
就会出现在app上。
这是使用Intents的演示。
activity_main.xml中
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context=".MainActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<Button
android:id="@+id/btn1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/btn_str1"
android:onClick="onClick"
/>
<Button
android:id="@+id/btn2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/btn2"
android:onClick="onClick2"
/>
</LinearLayout>
MainActivity.java
package com.example.usingintent;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Toast;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void onClick(View v)
{
startActivityForResult(new Intent("com.example.usingintent.SecondActivity"),1);
}
public void onClick2(View v)
{
Intent i = new Intent("com.example.usingintent.ThirdActivity");
i.putExtra("name", "My Name is Khan");
i.putExtra("age", 32);
Bundle extras = new Bundle();
extras.putString("name", "My name is Singh");
extras.putInt("age", 23);
i.putExtras(extras);
startActivityForResult(i,2);
}
public void onActivityResult(int requestcode,int resultcode,Intent i)
{
if(requestcode == 1)
{
if(resultcode == RESULT_OK)
{
Toast.makeText(this, i.getData().toString(), Toast.LENGTH_SHORT).show();
}
}
if(requestcode == 2)
{
if(resultcode==RESULT_OK)
{
Toast.makeText(this, i.getStringExtra("name"), Toast.LENGTH_SHORT).show();
Toast.makeText(this,i.getData().toString(), Toast.LENGTH_SHORT).show();
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
的AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.usingintent"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.usingintent.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".SecondActivity"
android:label="Second Activity">
<intent-filter >
<action android:name="com.example.usingintent.SecondActivity"/>
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".ThirdActivity"
android:label="Third Activity">
<intent-filter>
<action android:name="com.example.usingintent.ThirdActivity"/>
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
secondactivity.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:text="@string/str_second"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
<TextView
android:text="@string/str_second1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
<EditText
android:inputType="text"
android:id="@+id/edit_text"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
<Button
android:id="@+id/btn_second"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/btn_second1"
android:onClick="onClick"
/>
</LinearLayout>
thirdactivity.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
android:id="@+id/btn_third"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/str_btn2"
android:onClick="onClick"
/>
</LinearLayout>
SecondActivity.java
package com.example.usingintent;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
public class SecondActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.secondactivity);
}
public void onClick(View v)
{
Intent i = new Intent();
EditText edit = (EditText) findViewById(R.id.edit_text);
i.setData(Uri.parse(edit.getText().toString()));
setResult(RESULT_OK,i);
finish();
}
}
ThirdActivity.java
package com.example.usingintent;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
public class ThirdActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.thirdactivity);
Toast.makeText(this, getIntent().getStringExtra("name"), Toast.LENGTH_SHORT).show();
Toast.makeText(this, getIntent().getIntExtra("age",100),Toast.LENGTH_SHORT).show();
Bundle b = getIntent().getExtras();
Toast.makeText(this, b.getString("name"),Toast.LENGTH_SHORT).show();
Toast.makeText(this, b.getInt("age"), Toast.LENGTH_SHORT).show();
}
public void onClick(View v)
{
Intent i = new Intent();
i.putExtra("name", "Rahul");
i.setData(Uri.parse("Something passed to the main Activity"));
setResult(RESULT_OK,i);
finish();
}
}
谢谢!
答案 0 :(得分:0)
在你的清单中你有
<activity
android:name=".ThirdActivity"
android:label="Third Activity">
因此
new Intent("com.example.usingintent.AThirdActivity")
需要
new Intent("com.example.usingintent.ThirdActivity")
并且java文件应保留为ThirdActivity.java。错误从那里出现的不是AThirdActivity.java文件和清单中的相应活动。