Question

点击config.json中的var pg = require('pg') ,q = require('q') ,config = require('custom-modules/config.json') conString = 'postgres://'+ config.pg.admun +':' + config.pg.admpw + '@' + config.pg.host + ':' + config.pg.port + '/' + config.pg.defdb; function runSQL (sqlStatement) { var deferred = q.defer(); var results = []; // Get a Postgres client from the connection pool pg.connect(conString, function(err, client, done) { // SQL Query > Select Data var query = client.query(sqlStatement, function(err, res) { if(err) console.log(err); deferred.resolve(res); }); // After all data is returned, close connection and return results query.on('end', function() { client.end(); deferred.resolve(results); }); // Handle Errors if(err) { console.log(err); } }); return deferred.promise; };，我试图从runSQL("SELECT * FROM tablename").then(function(res) { // here you have access to the result of the query... with "res". console.log(res); });跳到MainActivity.java。我得到了这样的LogCat：

ToDoList.java

我的MainActivity.java中的代码是这样的：

button01

我的清单是这样的：

activity_main.xml

按钮的代码是：

07-06 00:50:04.487: W/dalvikvm(779): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
07-06 00:50:04.516: E/AndroidRuntime(779): FATAL EXCEPTION: main
07-06 00:50:04.516: E/AndroidRuntime(779): android.content.ActivityNotFoundException: No Activity found to handle Intent { act=com.example.splashscreen.ToDoList }
07-06 00:50:04.516: E/AndroidRuntime(779):  at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1622)
07-06 00:50:04.516: E/AndroidRuntime(779):  at android.app.Instrumentation.execStartActivity(Instrumentation.java:1417)
07-06 00:50:04.516: E/AndroidRuntime(779):  at android.app.Activity.startActivityForResult(Activity.java:3370)
07-06 00:50:04.516: E/AndroidRuntime(779):  at android.app.Activity.startActivityForResult(Activity.java:3331)
07-06 00:50:04.516: E/AndroidRuntime(779):  at android.app.Activity.startActivity(Activity.java:3566)
07-06 00:50:04.516: E/AndroidRuntime(779):  at android.app.Activity.startActivity(Activity.java:3534)
07-06 00:50:04.516: E/AndroidRuntime(779):  at com.example.splashscreen.MainActivity.button1Click(MainActivity.java:39)
07-06 00:50:04.516: E/AndroidRuntime(779):  at com.example.splashscreen.MainActivity.onClick(MainActivity.java:49)
07-06 00:50:04.516: E/AndroidRuntime(779):  at android.view.View.performClick(View.java:4204)
07-06 00:50:04.516: E/AndroidRuntime(779):  at android.view.View$PerformClick.run(View.java:17355)
07-06 00:50:04.516: E/AndroidRuntime(779):  at android.os.Handler.handleCallback(Handler.java:725)
07-06 00:50:04.516: E/AndroidRuntime(779):  at android.os.Handler.dispatchMessage(Handler.java:92)
07-06 00:50:04.516: E/AndroidRuntime(779):  at android.os.Looper.loop(Looper.java:137)
07-06 00:50:04.516: E/AndroidRuntime(779):  at android.app.ActivityThread.main(ActivityThread.java:5041)
07-06 00:50:04.516: E/AndroidRuntime(779):  at java.lang.reflect.Method.invokeNative(Native Method)
07-06 00:50:04.516: E/AndroidRuntime(779):  at java.lang.reflect.Method.invoke(Method.java:511)
07-06 00:50:04.516: E/AndroidRuntime(779):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
07-06 00:50:04.516: E/AndroidRuntime(779):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
07-06 00:50:04.516: E/AndroidRuntime(779):  at dalvik.system.NativeStart.main(Native Method)

启动画面工作正常，但是当我点击按钮时，它总是说不幸停止了。怎么了？

Answer 1

试试这种方式，

<Button
android:id="@+id/Button01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="To Do List"
android:onClick="Button_Click"
android:clickable="true" />

现在在Java类

中

 public void Button_Click(View i)
    {
 Intent intent = new Intent(getApplicationContext(),YOUR_CLASS_NAME.class);
startActivity(intent);

    }

Answer 2

清单文件中有两个意图。尝试删除goToToDolist活动中的意图。

Answer 3

在 button1Click 方法中，尝试更改以下内容：

startActivity(new Intent("com.example.splashscreen.ToDoList"));

为：

startActivity(new Intent(this, com.example.splashscreen.ToDoList.class));

发生这种情况的原因是因为根据Intent文档，您尝试创建意图的方式是错误的。您提供了一个包位置，但它需要一个操作。

Answer 4

试试这段代码：

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity{


Button button1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_sample);

    button1 = (Button)findViewById(R.id.Button01);
    button1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            Intent i = new Intent(MainActivity.this, ToDoList.class);
            startActivity(i);
        }
    });

}


}

我希望它有所帮助。

尝试跳转到另一个页面时出错

4 个答案: