Toast动画中的CharSequence没有出现?的Android

时间:2016-08-23 09:06:16

标签: java android

我是Android开发的新手,所以这是我的问题。 我有一系列按钮,我想显示Toast说"此按钮将启动" 按下按钮的getText值

修改

按钮数组的声明和初始化代码。

 final Button buttons[] = new Button[6];
    buttons[0] = (Button) findViewById(R.id.button1);
    buttons[1] = (Button) findViewById(R.id.button2);
    buttons[2] = (Button) findViewById(R.id.button3);
    buttons[3] = (Button) findViewById(R.id.button4);
    buttons[4] = (Button) findViewById(R.id.button5);
    buttons[5] = (Button) findViewById(R.id.button6);

所以,

    for(i = 0; i< buttons.length; i++){
        buttons[i].setOnClickListener(new View.OnClickListener() {
            public void onClick(View v){
                Log.d("test","Why is this not appearing in logcat");
                CharSequence buttonvalue = buttons[i].getText();
                Context context = getApplicationContext();
                System.out.println(buttonvalue);
                CharSequence text = "This button will launch" + buttonvalue + " App!!";
                int duration = Toast.LENGTH_SHORT;

                Toast toast = Toast.makeText(context, text, duration);
                toast.show();
            }
        });
    }

当我按下按钮时,应用程序编译得很好但崩溃了。我似乎无法调试它因为System.out.println()和Logcat都没有出现或我只是看错了地点。那么我应该在哪里找到这些消息呢?

组件树: enter image description here 这是一个截图: enter image description here

1 个答案:

答案 0 :(得分:3)

尝试按照我的示例,在没有LogCat的情况下实施起来更简单:

 private static final int[] idArray = {R.id.button0, R.id.button1, R.id.button2, R.id.button3, R.id.button4, R.id.button5};

private Button[] bt = new Button[idArray.length];

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

    for (int i=0; i<idArray.length; i++) {
        final int b = i;
        bt [b] = (Button)findViewById(idArray[b]); // Fetch the view id from array
        bt [b].setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {

 Toast.makeText(getApplicationContext(),"This button will launch" + bt[b].getText().toString() + " App!!";,Toast.LENGTH_LONG).show();                }
        });

    }
}